单词	union vent
释义	union vent dual vent, common vent, unit vent dual vent In plumbing, a single vent, 1 connected at the junction of two fixture drains, which serves as a vent for both.
随便看	dppkd dppl dppm dppn dppni dppo dppoa dppos dppp dpppe dppp/s dppps dppq dppr dpprg dpps dppsb dppsn dp/pt dppt dppt-l dppu dppv dpp vi dpp viii

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